Tumbler: setting initial currentIndex selects wrong item with wrap disabled

import QtQuick 2.10
import QtQuick.Controls 2.3

ApplicationWindow {
    id: window
    visible: true
    width: 600
    height: 440
    title: "contentY: " + view.contentY.toFixed(2)
           + ", originY: " + view.originY.toFixed(2)
           + ", currentIndex: " + view.currentIndex

    property Item view: tumbler.contentItem.children[0]

    Tumbler {
        id: tumbler
        model: 30
        currentIndex: 1
        anchors.fill: parent
        anchors.margins: 20
        wrap: false
        visibleItemCount: 7
    }
}